Fix Minecraft has not start because of an unknown error a popular solution to the problem tlauncher
Website link :-
https://www.java.com/download/ie_manu...
https://java-for-minecraft.com/en/
In this video , i self experienced by solving this error
##### Follow the steps ######
1). uninstall old java version
2). update new java by trying above mentioned links
3). install updated java
4). restart your pc
-------------------If this works for you -------------------
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